function HashMap() {
}

function put(key, value) {
	this[key] = value;
}
function get(key) {
	return this[key];
}
function contains(key) {
	return this.get(key) == null ? false : true;
}
function remove(key) {
	delete this[key];
}

HashMap.prototype.put = put;
HashMap.prototype.get = get;
HashMap.prototype.contains = contains;
HashMap.prototype.remove = remove;
